JP4277409B2 - Injection molding equipment - Google Patents

Injection molding equipment Download PDF

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JP4277409B2
JP4277409B2 JP2000038366A JP2000038366A JP4277409B2 JP 4277409 B2 JP4277409 B2 JP 4277409B2 JP 2000038366 A JP2000038366 A JP 2000038366A JP 2000038366 A JP2000038366 A JP 2000038366A JP 4277409 B2 JP4277409 B2 JP 4277409B2
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mold
movable
molded product
projecting piece
movable mold
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JP2001225367A (en
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橋 芳 幸 高
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、本体部に対して折返す方向に突出する突片により端部がアンダーカット状態となる成形品を射出成形する装置に関し、例えば、自動車の車体パネル等のように三次元形状を有する成形品を製造するのに用いられる射出成形装置に関するものである。
【０００２】
【従来の技術】
突片により端部がアンダーカット状態となる成形品としては、例えば図１４に示すようなものがある。図１４（ａ）および（ｂ）に示す成形品Ａは、自動車のフロントフェンダ・パネルであって、図１４（ｃ）に示すエンジンフード・パネルＨとの合せ部分に、本体部に対して折返す方向に屈曲した断面Ｌ形のフランジ状突片Ｂを有すると共に、本体部と突片Ｂとの角部分に、外観品質等を考慮して面取りＲが施してある。つまり、この成形品Ａは、上下に配置した固定型と可動型との間で本体部を横向きにして射出成形した際に、突片Ｂが型開き動作を妨げる状態すなわち突片Ｂにより端部がアンダーカット状態となるものである。
【０００３】
従来において、上記の成形品Ａを射出成形する装置としては、図１５に示すようなものがあった。図示の射出成形装置は、下側の固定型１０１と昇降駆動される上側の可動型１０２を備えると共に、固定型１０１に、成形品Ａの突片Ｂを含む端部を形成する入子１０３を備えている。入子１０３は、固定型１０１に対して斜め方向に移動自在に設けてあって、固定型１０１内で昇降するエジェクトプレート１０４に対して水平方向に移動可能に連結してある。
【０００４】
上記の射出成形装置は、図１５（ａ）に示す型閉じ状態で射出成形を行ったのち、図１５（ｂ）に示すように可動型１０２を上昇させ、続いてエジェクトプレート１０４を上昇させることにより、図１５（ｃ）に示すように、入子１０３を斜め上方に移動させてアンダーカット状態の成形品Ａの端部から入子１０３を離間させる。また、成形品Ａの端部と入子１０３とが離間した後には、固定型１０１に設けた図示しないエジェクト機構を作動させて固定型１０３から成形品Ａを完全に離型させる。
【０００５】
なお、上記の如く固定型１０１側に成形品Ａを残す射出成形装置のほかに、可動型１０２側に成形品Ａを残すものがあるが、この場合、可動型１０２側にエジェクト機構が必要になって構造が複雑化すると共に、成形品Ａの車体外観面にエジェクトピンの圧痕が残ることから、固定型１０１側に成形品Ａを残す射出成形装置の方が好ましい。
【０００６】
【発明が解決しようとする課題】
ところで、上記したような従来の射出成形装置を用いて図１４に示す成形品Ａを射出成形する場合には、成形品Ａの離型性を考慮して、固定型１０１と可動型１０２との合せ面を本体部と突片Ｂとの角部分近傍に設定する。一方、成形品Ａは、本体部と突片Ｂとの角部分に面取りＲを有するものとなっている。
【０００７】
そこで、従来では、図１６（ａ）に示すように、固定型１０１側で面取りＲを成形するようにして、固定型１０１と可動型１０２との合せ面を面取りＲのやや上側すなわち本体部側に設定し、成形品Ａの成形後において、合せ面により本体部の車体外観面に発生した段部ｄの切削除去および仕上げ加工をしていた。また、図１６（ｂ）に示すように、固定型１０１と可動型１０２との合せ面を成形品Ａの本体部と突片Ｂとの角に合せて設定し、成形品Ａの成形後において、角の切削加工および仕上げ加工により面取りＲを成形していた。つまり、従来の射出成形装置にあっては、成形後の成形品Ａの端部外側に複数工程の加工を行わねばならないという不具合があり、工数やコストの節減を図るうえでの改善が望まれていた。
【０００８】
【発明の目的】
本発明は、上記従来の状況に鑑みて成されたもので、本体部に対して折返す方向に突出する突片により端部がアンダーカット状態となる成形品を射出成形する装置であって、突片の基端部外側に、成形後の加工が不要となる状態で面取り等の所定成形部位を成形することができると共に、簡単な構造でアンダーカット状態の成形品の離型を良好に行うことができる射出成形装置を提供することを目的としている。
【０００９】
【課題を解決するための手段】
本発明に係わる射出成形装置は、請求項１として、固定型および可動型を備えると共に、本体部に対して折返す方向に突出する突片により端部がアンダーカット状態となる成形品を射出成形する装置であって、可動型に、成形品の端部内側に対応し且つ可動型本体との間で突片を成形する押し入子と、型開きの過程で作動して成形品を離型させるエジェクト手段を備えると共に、固定型に、突片の基端部外側に対応する突部をアンダーカット状態に備え、押し入子は、可動型本体において可動型の移動方向に対して傾斜した方向に移動自在に保持してあり、可動型に、エジェクト手段の作動前である型開きの初期移動範囲において可動型の移動方向への押し入子の移動を規制することで同押し入子を成形品の端部から離間する方向に移動させる動作規制手段を備えると共に、固定型および可動型のうちの少なくとも可動型側に、型開きの初期移動範囲において成形品の端部を押し入子側に変形させて突片を固定型の突部から離間させる端部離型手段を備えた構成としており、上記構成をもって従来の課題を解決するための手段としている。なお、請求項１において、突片の基端部は、成形品の本体部との角部分を含むものであり、固定型においてアンダーカット状態を成す突部は、望ましくは、成形品の突片よりも小さい突出寸法を有するものとする。また、エジェクト手段の作動前である可動型の型開きの初期移動範囲は、上記突部の突出寸法や、可動型の移動方向に対して押し入子の移動方向が成す傾斜角度に基づいて設定する。
【００１０】
本発明に係わる射出成形装置は、請求項２として、押し入子が、可動型の移動方向に対して傾斜した方向に可動型本体を摺動自在に貫通する保持ロッドを備えており、動作規制手段が、可動型の移動方向に移動可能であり且つ保持ロッドの反押し入子側の端部を可動型の移動方向に対して直交する方向に摺動自在に保持する保持プレートと、型開きの初期移動範囲において保持プレートを可動型本体側に押圧する弾性体と、保持プレートに一端部が固定され且つ型閉じ状態において他端部が固定型に当接するリターンピンを備えている構成とし、請求項３として、エジェクト手段が、保持プレートと可動型本体との間に配置され且つ動作規制手段の弾性体の押圧により移動した保持プレートが当接するエジェクトプレートと、エジェクトプレートに固定され且つ可動型本体を貫通する成形品押し出し用のエジェクトピンと、互いに当接した保持プレートおよびエジェクトプレートを可動型本体側に移動させるプレート駆動機構を備えた構成としている。なお、請求項３において、プレート駆動機構としては、保持プレートを駆動して両プレートをに移動させるものや、所定の負荷により係脱する機構で両プレートを連結してからエジェクトプレートを駆動するものを用いることができる。
【００１１】
また、本発明に係わる射出成形装置は、請求項４として、端部離型手段が、可動型の押し入子に、成形品の突片の内側に凹凸を成形する凹凸成形部を備えている構成とし、請求項５として、可動型が、動作規制手段および端部離型手段の作動後からエジェクト手段の作動完了に至る間に成形品の突片を押し入子から離間させる突片離型手段を備えている構成とし、請求項６として、突片離型手段が、可動型の移動方向に直交する方向に押し入子を摺動自在に貫通し且つ一端部が成形品の突片に対応する離型ピンと、離型ピンの一端部の面と押し入子の外側面とが同一面になる状態に離型ピンを弾性保持するスプリングと、可動型本体に形成され且つ押し入子の移動に伴って離型ピンの他端部が摺動接触する内壁面を備え、可動型本体の内壁面が、可動型の初期移動範囲に対応し且つ押し入子の移動方向に沿う傾斜面と、傾斜面に連続して可動型の移動方向に沿うピン押圧用平面を有している構成としている。
【００１２】
さらに、本発明に係わる射出成形装置は、請求項７として、端部離型手段が、押し入子との間で成形品の突片を成形し且つ可動型本体に対して押し入子側に進退可能な突片成形ブロックを備えると共に、突片成形ブロックおよび固定型に、可動型の初期移動範囲において協働して突片成形ブロックを押し入子側に前進させるカム機構を備えた構成とし、請求項８として、突片成形ブロックが、型閉じ位置よりも反押し入子側に後退可能に保持されており、カム機構が、突片成形ブロックおよび固定型のいずれか一方に、カムを備えると共に、他方に、カムが摺動自在に係合して突片成形ブロックを型閉じ位置の前後範囲に進退動作させるするたカム溝を備えた構成としている。なお、請求項８において、カム機構を構成するカムおよびカム溝は、少なくとも可動型の初期移動範囲において互いに係合するものであれば良く、例えばカム溝の端部を開放した構成とし、固定型と可動型が大きく離間するのに伴ってカムおよびカム溝が完全に離間するようにしても良い。
【００１３】
【発明の作用】
本発明の請求項１に係わる射出成形装置では、本体部に対して折返す方向に突出する突片により端部がアンダーカット状態となる成形品に対して、可動型の押し入子が成形品の端部内側に対応し、固定型においてアンダーカット状態の突部が突片の基端部外側に対応する。つまり、固定型の突部により、突片の基端部外側（本体部と突片との角部分外側）に面取り等の所定成形部位を成形する。これにより、固定型と可動型の合せ面は、突片側に設定されることになり、成形品の本体部に両型の合せ面による段部が発生しないものとなっている。
【００１４】
そして、当該射出成形装置では、型開きした際に可動型側に成形品が残るものとなっており、可動型の型開き過程において、固定型の突部から成形品の突片の基端部外側を離型するアンダーカット処理、および押し入子から成形品の端部を離型するアンダーカット処理を行い、最終的に可動型から成形品を離型する。
【００１５】
具体的には、可動型が型開きを開始して初期移動範囲を移動すると、その間、押し入子は、動作規制手段によって可動型の移動方向への移動は規制されるが、可動型本体に対して傾斜した方向に移動自在であるから、固定型側に残された状態になりつつ可動型の移動方向に直交する方向すなわち成形品の端部から離間する方向に移動する。このように押し入子が移動すると、その移動分だけ押し入子と固定型との間隔が増大するので、その間に介在する成形品の端部の変形が可能になり、端部離型手段によって成形品の端部を押し入子側に変形させ、固定型の突部から成形品の突片の基端部外側を離型するアンダーカット処理を行う。
【００１６】
その後、可動型が初期移動範囲を超えて移動すると、固定型と可動型とが大きく離間すると共に、可動型本体に対して押し入子が傾斜方向に大きくずれて、押し入子から成形品の端部を離型するアンダーカット処理を行い、最終的には押し入子およびエジェクト手段により可動型から成形品を離型する。
【００１７】
本発明の請求項２に係わる射出成形装置では、可動型が型開きの初期移動範囲を移動する間、弾性体で保持プレートを可動型本体側に押圧することにより、可動型本体を貫通する保持ロッドを介して押し入子を固定型側に押圧し、同押し入子が可動型の移動方向に移動するのを規制する。このとき、保持ロッドは、傾斜した状態で可動型本体を摺動自在に貫通し、且つ保持プレートにおいて可動型の移動方向に直交する方向に摺動自在であるから、可動型の移動方向に直交する方向にずれる。その結果、保持ロッドとともに押し入子が可動型の移動方向に直交する方向すなわち成形品の端部から離間する方向に移動する。
【００１８】
また、型閉じの際には、固定型にリターンピンが当接することにより、可動型本体に対して保持プレートが型閉じの位置に復帰すると共に、弾性体が蓄圧状態となり、保持プレートに連結した保持ロッドとともに押し入子が型閉じの位置に復帰する。
【００１９】
本発明の請求項３に係わる射出成形装置では、可動型が型開きの初期移動範囲を超えて移動すると、保持プレートをエジェクトプレートに当接させて可動型本体に対する押し入子の移動を一旦阻止し、可動型本体から押し入子が突出し過ぎないようにして成形品の大きな変形を防止する。その後、可動型がさらに移動すると、プレート駆動機構により、保持プレートおよびエジェクトプレートを可動型本体側に移動させる。実際には、可動型と両プレートとは相対的に移動するので、プレート駆動機構は、移動する可動型に対して両プレートの移動を阻止する働きをする。その結果、可動型から押し入子およびエジェクトピンが突出して成形品を離型させる。
【００２０】
本発明の請求項４に係わる射出成形装置では、可動型の押し入子に設けた凹凸成形部で成形品の突片の内側に凹凸を成形し、凹凸部分の互いに係合により成形品の端部を押し入子に拘束する。そして、型開きの初期移動範囲において押し入子が成形品の端部から離間する方向に移動した際に、成形品の端部を押し入子とともに移動させて変形させ、このように成形品の端部を押し入子側に変形させて成形品の突片の基端部外側を固定型の突部から離間させる。
【００２１】
本発明の請求項５に係わる射出成形装置では、請求項４に記載の端部離型手段によって成形品の突片の基端部外側を固定型の突部から離間させた後、エジェクト手段の作動前に、突片離型手段により成形品の突片を押し入子から離間させて、押し入子の凹凸成形部と成形品の凹凸との係合を解除し、その後に行う成形品の離型を容易にする。
【００２２】
本発明の請求項６に係わる射出成形装置では、請求項４に記載の端部離型手段によって成形品の突片の基端部外側を固定型の突部から離間させ、さらに、成形品の突片を押し入子から離間させる場合において、可動型の型開きに伴って可動型本体と押し入子とが相対的に移動する際に、押し入子に設けた離型ピンの他端部が可動型本体の内壁面に沿って摺動する。このとき、可動型が初期移動範囲を移動する間すなわち押し入子とともに成形品の突片の基端部外側を固定型の突部から離間させる間は、可動型本体の内壁面が押し入子の移動方向に沿う傾斜面になっているので、押し入子と離型ピンの位置関係は変化せず、離型ピンの一端部の面と押し入子の外側面とが同一面になる状態に維持される。その後、成形品の突片の基端部外側が固定型の突部から離間すると、可動型本体の内壁面が可動型の移動方向に沿うピン押圧用平面になっており、且つ押し入子が可動型本体に対して傾斜した方向に移動し続けるので、離型ピンがスプリングに抗して一端部方向に移動し、その結果、離型ピンの一端部が押し入子から突出して同押し入子から成形品の突片を離型させる。
【００２３】
本発明の請求項７に係わる射出成形装置では、可動型の型開きの初期移動範囲において、押し入子が成形品の端部から離間する方向に移動すると、可動型の突片成形ブロックおよび固定型に設けたカム機構の働きで突片成形ブロックが押し入子側に前進し、この突片成形ブロックにより成形品の端部を押し入子側に変形させて成形品の突片の基端部外側を固定型の突部から離間させる。
【００２４】
本発明の請求項８に係わる射出成形装置では、可動型の型開きの初期移動範囲において、押し入子が成形品の端部から離間する方向に移動すると、可動型の突片成形ブロックおよび固定型に設けたカム機構すなわちカムとカム溝とから成るカム機構の働きにより突片成形ブロックが押し入子側に前進し、成形品の端部を押し入子側に変形させて成形品の突片の基端部外側を固定型の突部から離間させる。その後、同カム機構の働きにより突片成形ブロックを型閉じ位置よりも反押し入子側に後退させ、これにより成形品の端部を解放して同端部の永久変形を防止する。
【００２５】
【発明の効果】
本発明の請求項１に係わる射出成形装置によれば、本体部に対して折返す方向に突出する突片により端部がアンダーカット状態となる成形品を射出成形する場合に、突片の基端部外側に、成形後の加工が不要となる状態で面取り等の所定成形部位を成形することができるようになり、例えば成形品が自動車の車体パネルである場合には、固定型と可動型との合せ面を突片の基端部よりも先の部分すなわち車体外観面にならない部分に設定することで、突片の基端部外側を含む車体外観面をきわめて良好に成形することができ、また、固定型と可動型との合せ面で段部が発生したとしても外観品質に何ら影響がないので、段部を除去する加工が一切不要になり、工数の削減や低コスト化なども実現することができる。
【００２６】
さらに、請求項１に係わる射出成形装置によれば、上記した効果に加えて、可動型の型開きの初期移動範囲において作動する動作規制手段および端部離型手段と、その後に作動するエジェクト手段を採用したことにより、固定型の突部から成形品の突片の基端部外側を離間させるアンダーカット処理、押し入子から成形品の端部を離型するアンダーカット処理、および成形品の離型を非常に円滑に行うことができる。しかも、固定型において突部がアンダーカット状態を成すものの、各手段の構成の全部あるいは大半が可動型側に設けられ、とくに動作規制手段はエジェクト手段に付随する構成にすることが可能であるため、装置の構造を簡単にすることができるとともに設備の大幅な変更も不要であり、設備費の低減や維持管理の容易化なども実現することができる。
【００２７】
本発明の請求項２に係わる射出成形装置によれば、請求項１と同様の効果を得ることができるうえに、保持ロッドを備えた押し入子と、保持プレート、弾性体およびリターンピンを備えた動作規制手段を採用したことにより、押し入子を駆動するためのアクチュエータ類が一切不要であって、可動型の型開き動作を利用した至って簡単な構造により押し入子を成形品の端部から離間させることができると共に、型閉じ動作を利用して押し入子を正しい型閉じ位置に復帰させることができ、装置の構造のさらなる簡略化や設備費のさらなる低減などに貢献することができる。
【００２８】
本発明の請求項３に係わる射出成形装置によれば、請求項２と同様の効果を得ることができるうえに、エジェクトプレート、エジェクトピンおよびプレート駆動機構を備えたエジェクト手段を採用したことにより、動作規制手段および端部離型手段の作動後には、可動型本体からの押し入子の過大な突出を阻止して成形品の大きな変形を防止することができ、その後は、押し入子から成形品の端部を離型するアンダーカット処理を行いながら、押し入子をエジェクトピンと同様に使用して成形品の離型を良好に行うことができる。この際、押し入子の保持プレートとエジェクトプレートとを共通のプレート駆動機構で駆動することから、この点においても構造の簡略化や設備費の低減に貢献することができる。
【００２９】
本発明の請求項４に係わる射出成形装置によれば、請求項１〜３と同様の効果を得ることができるうえに、端部離型手段として可動型の押し入子に凹凸形成部を設けたことから、押し入子を成形品の端部から離間する方向に移動させたときに、きわめて簡単な構造により、移動する押し入子に成形体の端部を拘束した状態にして、固定型の突部から成形品の突片の基端部外側を離型するアンダーカット処理を確実に行うことができる。
【００３０】
本発明の請求項５に係わる射出成形装置によれば、請求項４と同様の効果を得ることができるうえに、請求項４に記載の端部離型手段によって成形品の突片の基端部外側を固定型の突部から離間させた後、突片離型手段で成形品の突片と押し入子との凹凸部分の係合を解除することから、押し入子から成形品の端部を離型するアンダーカット処理および可動型からの成形品の離型を容易に行うことができる。
【００３１】
本発明の請求項６に係わる射出成形装置によれば、請求項５と同様の効果を得ることができるうえに、傾斜面とピン押圧用平面を有する可動型本体の内壁面、離型ピンおよびスプリングを備えた突片離型手段を採用したことから、可動型本体と押し入子との相対的な移動を利用したきわめて簡単な構造により、成形品の突片を押し入子から確実に離間させることができる。
【００３２】
本発明の請求項７に係わる射出成形装置によれば、請求項１〜３と同様の効果を得ることができるうえに、突片成形ブロックおよびカム機構を備えた端部離型手段を採用したことから、押し入子を成形品の端部から離間する方向に移動させた際に、可動型の型開き動作を利用した簡単な構造によって、突片成形ブロックで成形品の端部を押圧して、固定型の突部から成形品の突片の基端部外側を離型するアンダーカット処理を確実に行うことができ、とくに、突片成形ブロックで成形品の突片の基端部外側を固定型の突部から押出す構造であるから、固定型の突部と成形品との干渉をより確実に回避することができる。
【００３３】
本発明の請求項８に係わる射出成形装置によれば、請求項７と同様の効果を得ることができるうえに、端部離型手段のカム機構としてカムおよびカム溝を採用したことから、可動型の型開き動作を利用したきわめて簡単な構造により、端部離型手段の突片成形ブロックを円滑に進退駆動することができ、また、固定型の突部から成形品の突片の基端部外側を離型するアンダーカット処理の後に、突片成形ブロックを型閉じ位置よりも反押し入子側に後退させることにより、成形品の端部を解放して同端部の永久変形を防止することができ、ひいては成形品の品質向上に貢献し得る。
【００３４】
【実施例】
図１〜図６は本発明に係わる射出成形装置の一実施例を説明する図である。
【００３５】
図１〜図３に示す射出成形装置は、下側の固定型１と上側の可動型２との間において、突片Ｂにより端部がアンダーカット状態となる成形品Ａを射出成形する。この実施例の成形品Ａは、図１４に示す自動車のフロントフェンダ・パネルであって、エンジンフード・パネルＨとの合せ部分に、本体部に対して折返す方向に突出する断面概略Ｌ形の突片Ｂを有すると共に、本体部との角部分を含む突片Ｂの基端部Ｄの外側に、外観品質等を考慮して面取りＲが施してある。つまり、この成形品Ａは、固定型１と可動型２との間で本体部を横向きにして射出成形した際に、突片Ｂが型開き動作を妨げる状態すなわちアンダーカット状態となる。なお、特許請求の範囲に記載した『可動型の移動方向』は図１の上下方向であり、同じく『可動型の移動方向に直交する方向』は図１の左右方向である。
【００３６】
固定型１は、図示しない溶融樹脂供給装置に固定される取付け板３と、成形空間を形成する固定型本体４を備えると共に、１次スプルーブッシュ５、ホットランナブロック６および２次スプルーブッシュ７によって溶融樹脂供給装置から成形空間に至るゲートを形成しており、取付け板３およびホットランナブロック６と固定型本体４との間には断熱板８が介装してある。
【００３７】
可動型２は、図示しない昇降装置に固定される取付け板９と、成形空間を形成する可動型本体１０を備えると共に、取付け板９と可動型本体１０との間に、複数のスペーサ１１を設けて後記するプレート類の収容空間１２を形成し、取付け板９とスペーサ１１との間には断熱板１３が介装してある。
【００３８】
そして、射出成形装置は、可動型２に、成形品Ａの端部内側に対応し且つ可動型本体１０との間で突片Ｂを成形する押し入子１４と、型開きの過程で作動して成形品Ａを離型させるエジェクト手段を備えると共に、固定型１の固定型本体４に、突片Ｂの基端部Ｄの外側に対応して面取りＲを成形する突部１５をアンダーカット状態に備えている。つまり、当該射出成形装置では、固定型１側で面取りＲを成形することにより、固定型１と可動型２の合せ面が突片Ｂの水平部分に設定されることになり、成形品Ａの本体部に両型１，２の合せ面による段部（図１６参照）が発生しないものとなっている。
【００３９】
さらに、射出成形装置は、可動型２に、エジェクト手段の作動前である型開きの初期移動範囲において可動型２の移動方向への押し入子１４の移動を規制することで同押し入子１４を成形品Ａの端部から離間する方向（図１の右方向）に移動させる動作規制手段を備えると共に、型開きの初期移動範囲において成形品Ａの端部を押し入子１４側に変形させて突片Ｂの基端部Ｄの外側を固定型１の突部１５から離間させる端部離型手段を備えている。なお、可動型２の可動型本体１０は、その一部を分割した状態の突片成形ブロック１６を備えており、固定の突片成形ブロック１６と可動の押し入子１４との間で突片Ｂを成形する。
【００４０】
押し入子１４は、可動型本体１０を一部分割したブロック状を成すと共に、上側に保持ロッド１７の下端部が連結してある。保持ロッド１７は、可動型２の移動方向に対して傾斜した方向に可動型本体１０を摺動自在に貫通している。これにより、押し入子１４は、保持ロッド１７の軸線方向すなわち成形品Ａの端部から離間する傾斜方向に移動自在に保持されている。
【００４１】
保持ロッド１７は、反押し入子側の端部である上端部が、収容空間１２において昇降可能な保持プレート１８に連結してある。このとき、保持ロッド１７は、保持プレート１８を貫通すると共に、上端部にスライドブロック１９を備えている。他方、保持プレート１８の上面には、スライドブロック１９が摺動自在に係合するスライドプレート２０が設けてある。これにより、保持ロッド１７は、保持プレート１８に対して、上下方向の移動が規制され、且つ傾斜に対応した水平方向に移動可能になっている。
【００４２】
保持プレート１８は、型開きの初期移動範囲において当該保持プレート１８を可動型本体１０側に押圧する弾性体２１と、可動型本体１０を摺動自在に貫通し且つ型閉じ状態において下端部が固定型本体４の上面に当接するリターンピン２２を備えている。弾性体２１は、型閉じ状態において上側の取付け板９との間で圧縮され、保持プレート１８を下側に押圧する。そして、この実施例では、保持プレート１８、弾性体２１およびリターンピン２２により、型開きの初期移動範囲において押し入子１４の上昇のみを規制する動作規制手段を構成している。
【００４３】
エジェクト手段は、保持プレート１８と可動型本体１０との間に配置され且つ弾性体２１の押圧により移動した保持プレート１８が当接するエジェクトプレート２３と、エジェクトプレート２３に固定され且つ可動型本体１０を貫通する成形品押し出し用の複数のエジェクトピン２４と、互いに当接した保持プレート１８およびエジェクトプレート２３を可動型本体１０側に移動させるプレート駆動機構を備えている。
【００４４】
各エジェクトピン２４には、エジェクトプレート２３と可動型本体１０との間に保持ばね２６が介装してある。また、エジェクトプレート２３には、その上側の保持プレート１８を貫通して取付け板９に当接するストッパピン３４が設けてある。そして、エジェクトプレート２３は、保持ばね２６およびストッパピン３４によって可動型本体１０との間隔が一定に保たれている。この状態において、各エジェクトピン２４は、その下端面が可動型本体１０の下面と同一面状となる位置に保持される。さらに、取付け板９と可動型本体１０との間には、保持プレート１８およびエジェクトプレート２３を上下方向に案内するガイドロッド２５が設けてある。
【００４５】
プレート駆動機構は、エジェクトプレート２３に固定され且つ保持プレート１８および取付け板９を貫通する駆動ロッド２７と、両プレート１８，１９間で互いに係脱可能な係合装置２８で構成してある。駆動ロッド２７は、図示しない上端面が昇降装置側の固定部位に相対向する状態で配置してあり、可動型２の上昇過程で固定部位に当接する。係合装置２８は、例えば、一対のローラを弾性保持した一方の装置と両ローラ間への係合体を設けた他方の装置とから成ると共に、所定以上の負荷によって両ローラと係合体とを係合離脱させるものであって、両プレート１８，２３の外周の数箇所に設けてある。つまり、この実施例のプレート駆動機構は、可動型２の上昇過程において、係合装置２８で両プレート１８，１９を一体化させ、その後、駆動ロッド２７を固定部位に当接させて両プレート１８，２３の上昇を阻止することにより、可動型本体１０に対して両プレート１８、２３を相対的に移動させるものとなっている。
【００４６】
端部離型手段は、可動型２の押し入子１４に、成形品Ａの突片Ｂの内側、とくに図３において突片Ｂの水平部分の下面に凹凸（この実施例では凸）を成形する凹凸成形部２９を備えている。この実施例では、２個の凹凸成形部２９が設けてある。また、この実施例では、押し入子１４に上記端部離型手段を設けたことから、可動型２に、動作規制手段（１８，２１，２２）および端部離型手段（２９）の作動後からエジェクト手段（２３，２４，２７，２８）の作動完了に至る間に成形品Ａの突片Ｂを押し入子１４から離間させる突片離型手段を備えている。
【００４７】
突片離型手段は、平面状の一端部および球面状の他端部を有する離型ピン３０と、離型ピン３０を他端部方向（図３の右方向）に付勢するスプリング３１と、離型ピン３０の他端部が摺動接触する可動型本体１０の内壁面３２を備えている。離型ピン３０は、押し入子１４を水平方向に摺動自在に貫通すると共に、一端部図３において突片Ｂの垂直部分に対応している。そして、スプリング３１で他端部方向に付勢される一方で、押し入子１４に固定したストッパ３３によって他端部側への移動が規制されており、この状態で、一端部の面が押し入子１４の外側面と同一面になるように保持されている。可動型本体１０の内壁面３２は、可動型２の初期移動範囲に対応し且つ押し入子１４の移動方向に沿う上側の傾斜面３２Ａと、傾斜面３２Ａに連続して可動型２の移動方向に沿う垂直なピン押圧用平面３２Ｂを有している。
【００４８】
上記の射出成形装置では、固定型本体４においてアンダーカット状態である突部１５の突出寸法が、成形品Ａの突片Ｂの突出寸法よりも明らかに小さいものとなっている。また、エジェクト手段の作動前である可動型２の型開きの初期移動範囲は、上記突部１５の突出寸法や、可動型２の移動方向に対して押し入子１４の移動方向が成す傾斜角度に基づいて設定する。
【００４９】
図１〜図３に示す型閉じの状態では、固定型本体４と可動型本体１０および押し入子１４との間で成形品Ａの成形空間を形成しており、可動型２では、取付け板９と保持プレート１８との間で弾性体２１を圧縮すると共に、保持プレート１８とエジェクトプレート２３とが一定の隙間Ｓ１をおいて保持されている。そして、型開きの初期移動範囲は、図２に示す上記隙間Ｓ１に相当し、また、突片離型手段を構成する傾斜面３２Ａにおいて、離型ピン３０の中心から傾斜面３２Ａの下端までの高さＳ２に相当する。
【００５０】
次に、上記構成を備えた射出成形装置の作用を説明する。
【００５１】
当該射出成形装置では、型開きした際に可動型２側に成形品Ａが残るものとなっており、可動型２の型開き過程において、固定型本体４の突部１５から成形品Ａにおける突片Ｂの基端部Ｄの外側を離型するアンダーカット処理、および押し入子１４から成形品Ａの端部を離型するアンダーカット処理を行い、最終的に可動型２から成形品Ａを離型する。
【００５２】
すなわち、射出成形装置では、図１〜図３に示す型閉じの状態にして成形空間に溶融樹脂を加圧充填し、溶融樹脂が凝固した後に可動型２を上昇させる。可動型２が型開きを開始して初期移動範囲を上昇すると、その間、押し入子１４は、動作規制手段の弾性体２１によって押し下げられるので、実質的に上方向の移動が規制される。このとき、押し入子１４は、可動型本体１０に対しては保持ロッド１７を介して傾斜した方向に移動自在であり、また、保持プレート１８に対しては保持ロッド１７を介して水平方向に移動自在であるから、可動型本体１０の上昇に伴って、図４および図５に示すように、固定型１側に残された状態になりつつ成形品Ａの端部から離間する水平方向に移動することになる。
【００５３】
さらに、射出成形装置では、初期移動範囲に相当する分だけ固定型本体４と可動型本体１０とが離間し、押し入子１４と可動型本体１０とが離間すると共に、保持プレート１８がエジェクトプレート２３に当接して、両プレート１８，２３が係合装置２８により連結される。これにより、可動型本体１０に対する保持プレート１８の接近を一旦阻止し、可動型本体１０から押し入子１４が突出し過ぎないようにして、成形品Ａの大きな変形を防止する。
【００５４】
また、突片離型手段では、初期移動範囲の間、離型ピン３０の他端部が押し入子１４の移動方向に沿う傾斜面３２Ａに接触しているので、押し入子１４と離型ピン３０の位置関係は変化せず、離型ピン３０の一端部の面と押し入子１４の外側面とが同一面状に維持される。そして、離型ピン３０の他端部中心が傾斜面３２Ａとピン押圧用平面３２Ｂとの境目に到達する。
【００５５】
上記の如く押し入子１４が水平移動すると、その移動分だけ押し入子１４と固定型本体４との間隔が増大するので、その間に介在する成形品Ａの端部の変形が可能になり、端部離型手段によって成形品Ａの端部を押し入子側に変形させ、固定型本体４の突部１５から成形品Ａにおける突片Ｂの基端部Ｄの外側を離型するアンダーカット処理を行う。つまり、この実施例では、端部離型手段が押し入子１４に設けた凹凸成形部２９であるから、凹凸成形部２９で突片Ｂに凹部が成形され、凹凸部分の互いに係合によって成形品Ａの端部が押し入子１４に拘束された状態になっている。したがって、押し入子１４が水平方向に移動すると、成形品Ａの端部が変形を伴って押し入子１４とともに移動し、突片Ｂを含む端部を固定型本体４および突部１５から強制的に剥すように離型させる。
【００５６】
その後、可動型２が初期移動範囲を超えて上昇すると、可動型２とともに押し入子１４も上昇して固定型１と可動型２とが大きく離間し、その後、エジェクト手段および突片離型手段が作動を開始する。エジェクト手段では、駆動ロッド２７の上端部が昇降装置側の固定部位に当接し、係合装置２８により連結された保持プレート１８およびエジェクトプレート２３の上昇を阻止する。これにより、上昇し続ける可動型本体１０に対して、押し入子１４が斜め下方に突出すると共に、保持ばね２６を圧縮しつつエジェクトピン２４も下方に突出する。
【００５７】
また、上記の如くエジェクト手段が作動を開始すると、突片離型手段では、離型ピン３０の他端部がピン押圧用平面３２Ｂに接触する。このとき、押し入子１４が傾斜方向に移動するのに対して、離型ピン３０が接触するピン押圧用平面３２Ｂが垂直面となっているので、図６に示すように、離型ピン３０がスプリング３１に抗して一端部方向に移動し、離型ピン３０の一端部が押し入子１４から突出し、凹凸成形部２９と突片Ｂの凹部との係合を強制的に解除して押し入子１４から突片Ｂを離型させる。
【００５８】
このように、当該射出成形装置では、端部離型手段として凹凸成形部２９を採用しているので、上記のタイミングで作動する突片離型手段、すなわちエジェクト手段の作動開始とともに作動を開始し且つエジェクト手段の作動完了以前に作動を完了する突片離型手段を用いることにより、成形品Ａを離型する際の端部の変形を防止すると共に、全体の離型を容易にする。
【００５９】
その後は、可動型本体１０から押し入子１４が斜め下方に大きく突出して、押し入子１４から成形品Ａの端部を離型するアンダーカット処理を終了し、同時に可動型本体１０からエジェクトピンが下方に大きく突出し、最終的に押し入子１４およびエジェクトピン２４で成形品Ａを可動型２から完全に離型させる。
【００６０】
さらに、射出成形装置は、次の射出成形を行うために可動型２を下降させていくと、型開きの際に圧縮された保持ばね２６の作用により、両プレート１８，２３および押し入子１４がその位置に止まろうとするのに対して可動型本体１０が下降し、この相対的な移動によりエジェクトピン２４が型閉じの位置に復帰するのに続いて、離型ピン３０の他端部が傾斜面３２Ａに移行し、同離型ピン３０がスプリング３１の作用により型閉じの位置に復帰する。また、ストッパピン３４が取付け板９に当接して、エジェクトプレート２３と可動型本体１０との相対的な移動が停止する。
【００６１】
そして、さらに可動型２が下降すると、型開きの初期移動範囲である型閉じの最終移動範囲において、リターンピン２２が固定型本体４の上面に当接して保持プレート１８の下降を阻止し、このとき、エジェクトプレート２３はストッパピン３４により上方向の移動が規制されているので、係合装置２８が解除されて保持プレート１８がエジェクトプレート２３から離間すると共に、弾性体２１を圧縮しつつ保持プレート１８、保持ロッド１７および押し入子１４が型閉じの位置に復帰する。
【００６２】
このように、上記実施例で説明した射出成形装置は、本体部に対して折返す方向に突出する突片Ｂにより端部がアンダーカット状態となる成形品（フロントフェンダ・パネル）Ａを射出成形するに際し、固定型１と可動型２との合せ面（突部１５と可動型本体１０との合せ面）を車体外観面にならない突片Ｂ側に設定して、突片Ｂの基端部Ｄの外側に、成形後の加工が不要となる状態で面取りＲを成形し得ることとなり、面取りＲを含む車体外観面をきわめて良好に成形する。また、たとえ固定型１と可動型２との合せ面で段部が発生したとしても外観品質には何ら影響がないので、後に段部を除去する加工が一切不要である。
【００６３】
さらに、上記射出成形装置は、複数箇所にアンダーカット状態を有するものであるが、プレート駆動機構（２７，２８）を含むエジェクト手段（２３，２４，２７，２８）、動作規制手段（１８，２１，２２）、端部離型手段（２９）および突片離型手段（３０，３１，３２Ａ，３２Ｂ）を採用したことにより、固定型本体４の突部１５から成形品Ａにおける突片Ｂの基端部Ｄの外側を離間させるアンダーカット処理、押し入子１４からの成形品Ａの突片Ｂの離型、押し入子１４から成形品Ａの端部を離型するアンダーカット処理、および成形品Ａ全体の離型を連続的に円滑に行うものとなっている。
【００６４】
しかも、エジェクト手段、端部離型手段および突片離型手段は、いずれも可動型１の型開き動作を利用して作動する簡単な構造であって、専用のアクチュエータ類が全く不要であり、とくに、動作規制手段はエジェクト手段に付随する構成にすることが可能であると共に、端部離型手段にあっては突片Ｂに凹凸を成形する凹凸成形部２９というきわめて簡単な構造である。さらに、上記各手段はいずれも可動型１側に設けられるので、既存の設備を一部変更するだけで当該射出成形装置とすることも可能である。
【００６５】
なお、上記実施例では、エジェクト手段におけるプレート駆動機構として、両プレート１８，２３を連結する係合装置２８と、エジェクトプレート２３を可動型本体１０側に移動させる（型開きの際に上昇を阻止する）駆動ロッド２７を例示したが、保持プレート１８と昇降装置の固定部位との間に設ける駆動ロッドを採用することで、係合装置２８を省略することも可能である。
【００６６】
図７〜図１１は、本発明に係わる射出成形装置の他の実施例を説明する図である。この実施例の射出成形装置は、先の実施例のものと比較すると、基本的な構成は図１に示すものとほぼ同様であるが、端部離型手段すなわち型開きの初期移動範囲において成形品Ａの端部を押し入子１４側に変形させて突片Ｂの基端部Ｄの外側を固定型１の突部１５から離間させる手段が異なると共に、押し入子１４には突片離型手段が無いものとなっている。なお、先の実施例と同一の構成部位は、同一符号を付して詳細な説明を省略する。
【００６７】
図７に示す射出成形装置の端部離型手段は、押し入子１４との間で成形品Ａの突片Ｂを成形し且つ可動型本体１０に対して押し入子１４側に進退可能な突片成形ブロック１６を備えると共に、突片成形ブロック１６および固定型１の固定型本体４に、可動型１の初期移動範囲において協働して突片成形ブロック１６を押し入子１４側に前進させるカム機構を備えている。
【００６８】
突片成形ブロック１６は、可動型本体１０との間に介装したスライド機構４１により押し入子１４に対して水平に進退可能であって、可動型本体１０との間に介装した戻しばね４２で後退方向（図７の左方向）に付勢してあると共に、可動型本体１０に設けたストッパブロック４３で後退位置が規制される。この突片成形ブロック１６の進退範囲は、図７において突片Ｂの垂直部分に対応する先端部１６Ａが可動型本体１０の内部側面よりも押し入子１４側に突出する前進位置と、同先端部１４Ａが可動型本体１０の内部側面よりも反押し入子１４側に没入してストッパブロック４３で規制される後退位置との間である。
【００６９】
また、突片成形ブロック１６は、型閉じの際にカム機構で位置決めすることが可能であるが、位置決め動作をより確実にするために後端部にカム面４４を有しており、このカム面４４を固定型本体４のカム面４５に当接させることにより、先端部１６Ａが可動型本体１０の内部側面と同一面状となる型閉じの位置に保持される。
【００７０】
カム機構は、図８にも示すように、突片成形ブロック１６の側面に設けた円形のカム４６と、固定型本体４に設けたカムブロック４７のカム溝４８とで構成してある。カム溝４８は、押し入子１４側に屈曲した『く』の字形の溝であると共に、上端部が開放されており、突片成形ブロック１６のカム４６が摺動自在に係合する。
【００７１】
上記構成を備えた射出成形装置は、射出成形をした後、可動型２の型開きの初期移動範囲において、図９に示すように、押し入子１４が成形品Ａの端部から離間する方向に水平移動すると、互いに係合しているカム溝４８とカム４６との相対的な移動に伴って、突片成形ブロック１６が戻しばね４２を圧縮しつつ押し入子１４側に移動し、図１０に示すように、先端部１６Ａによって突片Ｂを押し入子１４側に押圧する。このとき、カム４６は、『く』の字形を成すカム溝４８の屈曲部分に位置している。これにより、成形品Ａにおける突片Ｂの基端部Ｄの外側を固定型本体４の突部１５から離型させるアンダーカット処理が行われる。
【００７２】
次に、可動型２が初期移動範囲を超えて上昇し、成形品Ａの端部が固定型本体４から完全に離間すると、カム溝４８とカム４６との相対的な移動に伴って突片成形ブロック１６が後退し、図１１に示すように、先端部１６Ａが可動型本体１０の内部側面よりも後退する。これにより、成形品Ａの端部は、その突片Ｂが押し入子１４に引っ掛かった自由状態になり、永久変形が防止されると共に、後の離型が容易になる。また、可動型２がさらに上昇すると、カム４６がカム溝４８から離脱し、その後は先の実施例と同様に成形品Ａの離型が行われる。
【００７３】
このように、上記実施例の射出成形装置にあっても、とくに端部離型手段（１６，４６，４８）において、専用のアクチュエータ類を用いることなく、可動型２の型開き動作を利用する簡単な構造により、突部１５から突片Ｂの基端部Ｄの外側を離型するアンダーカット処理が良好に行われることとなる。
【００７４】
ここで、突部１５から突片Ｂの基端部Ｄの外側を離型する場合、先の実施例のように、凹凸の係合で成形品Ａの端部を押し入子１４に拘束するものでは、成形品Ａの端部が押し入子１４側に変形する際に、同端部がやや上方にも変形することから、図１２に示すように、面取りＲの部分が円弧状の軌跡Ｃ１を描きながら離型する。これに対して、上記実施例のように、突片成形ブロック１６で突片Ｂの基端部Ｄの外側を突部１５から水平に押出すものでは、図１３に示すように、面取りＲの部分が直線状の軌跡Ｃ２を描きながら離型するので、突部１５と成形品Ａとの干渉をより確実に回避することができる。したがって、突片Ｂの基端部Ｄの外側に面取りＲを成形する場合には、各実施例のいずれもとくに問題は無いが、例えば、突片Ｂの基端部Ｄの外側に段状の所定成形部位を設ける場合には、上記実施例のように突片Ｂを水平に押出す構造である方がより望ましい。
【００７５】
なお、上記実施例では、カム機構として、突片成形ブロック１６側のカム４６と固定型本体４側のカムブロック４６およびカム溝４８を例示したが、カム４６とカム溝４８とを上下逆の関係にすることが可能であると共に、それ以外のカム機構も当然採用することができる。
【図面の簡単な説明】
【図１】本発明に係わる射出成形装置の一実施例を説明する断面図である。
【図２】図１に示す射出成形装置の要部を説明する断面図である。
【図３】図１に示す押し入子付近を拡大して説明する断面図である。
【図４】可動型が初期移動範囲を上昇したときの射出成形装置の要部を説明する断面図である。
【図５】図４に示す押し入子付近を拡大して説明する断面図である。
【図６】図５の状態からさらに可動型が上昇して突片離型手段が作動した状態を説明する断面図である。
【図７】本発明に係わる射出成形装置の他の実施例を説明する図であって、型閉じ状態における押し入子付近を拡大して説明する断面図である。
【図８】突片成形ブロックおよびカムブロックとともにカム機構を説明する斜視図である。
【図９】図７に示す状態から可動型が初期移動範囲を上昇した状態を説明する断面図である。
【図１０】図９に示す状態から可動型がさらに上昇して突片離型手段の突片成形ブロックが前進した状態を説明する断面図である。
【図１１】図１０に示す状態から可動型がさらに上昇して突片成形ブロックが後退した状態を説明する断面図である。
【図１２】図１〜図６に示す実施例の射出成形装置において、固定型の突部から突片の基端部外側が離型する際の軌跡を説明する断面図である。
【図１３】図７〜図１１に示す実施例の射出成形装置において、固定型の突部から突片の基端部外側が離型する際の軌跡を説明する断面図である。
【図１４】成形品の一例として自動車のフロントフェンダ・パネルを説明する車体外側の斜視図（ａ）、車体内側の斜視図（ｂ）およびフード・パネルとの合せ部分を示す断面図（ｃ）である。
【図１５】従来の射出成形装置を説明する型閉じ状態の断面図（ａ）、型開き途中の断面図（ｂ）および型開き完了の断面図（ｃ）である。
【図１６】従来の射出成形装置における固定型と可動型との合せ面および成形品を説明する各々断面図（ａ）（ｂ）である。
【符号の説明】
Ａ 成形品
Ｂ 突片
Ｄ 突片の基端部
１ 固定型
２ 可動型
１０ 可動型本体
１４ 押し入子
１５ 突部
１６ 突片成形ブロック（端部離型手段）
１７ 保持ロッド
１８ 保持プレート（動作規制手段）
２１ 弾性体（動作規制手段）
２２ リターンピン（動作規制手段）
２３ エジェクトプレート（エジェクト手段）
２４ エジェクトピン（エジェクト手段）
２７ 駆動ロッド（エジェクト手段のプレート駆動機構）
２８ 係合装置（エジェクト手段のプレート駆動機構）
２９ 凹凸成形部（端部離型手段）
３０ 離型ピン（突片離型手段）
３１ スプリング（突片離型手段）
３２ 内壁面（突片離型手段）
３２Ａ 傾斜面（突片離型手段）
３２Ｂ ピン押圧用平面（突片離型手段）
４６ カム（端部離型手段のカム機構）
４８ カム溝（端部離型手段のカム機構）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for injection-molding a molded product whose end is undercut by a projecting piece protruding in a direction to be folded back with respect to a main body, and has a three-dimensional shape, such as a vehicle body panel, for example. The present invention relates to an injection molding apparatus used for manufacturing a molded product.
[0002]
[Prior art]
An example of a molded product whose end is undercut by the projecting piece is shown in FIG. A molded product A shown in FIGS. 14 (a) and 14 (b) is a front fender panel of an automobile, and is folded with respect to the main body portion at the mating portion with the engine hood panel H shown in FIG. 14 (c). The flange-shaped projecting piece B having an L-shaped cross section bent in the returning direction is provided, and chamfering R is applied to corner portions of the main body and the projecting piece B in consideration of appearance quality and the like. That is, when the molded product A is injection-molded with the main body sideways between the fixed mold and the movable mold arranged above and below, the end of the projecting piece B hinders the mold opening operation, that is, the end of the projecting piece B. Is undercut.
[0003]
Conventionally, there has been a device as shown in FIG. 15 for injection molding the above-described molded product A. The illustrated injection molding apparatus includes a lower fixed mold 101 and an upper movable mold 102 that is driven to move up and down, and a fixed mold 101 that includes an insert 103 that forms an end including the protruding piece B of the molded product A. I have. The insert 103 is provided so as to be movable in an oblique direction with respect to the fixed mold 101 and is connected to an eject plate 104 that moves up and down in the fixed mold 101 so as to be movable in the horizontal direction.
[0004]
The injection molding apparatus performs the injection molding in the mold closed state shown in FIG. 15A, then raises the movable mold 102 as shown in FIG. 15B, and then raises the eject plate 104. Thus, as shown in FIG. 15C, the insert 103 is moved obliquely upward to separate the insert 103 from the end of the undercut molded product A. Further, after the end of the molded product A and the insert 103 are separated from each other, an eject mechanism (not shown) provided on the fixed mold 101 is operated to completely release the molded product A from the fixed mold 103.
[0005]
In addition to the injection molding apparatus that leaves the molded product A on the fixed mold 101 side as described above, there is an apparatus that leaves the molded product A on the movable mold 102 side. In this case, an eject mechanism is required on the movable mold 102 side. Thus, the structure becomes complicated, and the impression pin indentation remains on the exterior surface of the molded article A. Therefore, the injection molding apparatus that leaves the molded article A on the fixed mold 101 side is preferable.
[0006]
[Problems to be solved by the invention]
By the way, when the molded product A shown in FIG. 14 is injection-molded using the conventional injection molding apparatus as described above, the fixed mold 101 and the movable mold 102 are taken into consideration in view of the releasability of the molded product A. The mating surface is set in the vicinity of the corner portion between the main body portion and the projecting piece B. On the other hand, the molded product A has a chamfer R at a corner portion between the main body portion and the projecting piece B.
[0007]
Therefore, conventionally, as shown in FIG. 16A, the chamfer R is formed on the fixed mold 101 side, and the mating surface of the fixed mold 101 and the movable mold 102 is slightly above the chamfer R, that is, on the main body side. After the molding of the molded product A, the step portion d generated on the vehicle body exterior surface of the main body portion was removed and finished by the mating surface. Also, as shown in FIG. 16B, the mating surface of the fixed mold 101 and the movable mold 102 is set according to the corners of the main body portion of the molded product A and the protruding piece B, and after molding of the molded product A, The chamfer R was formed by corner cutting and finishing. In other words, in the conventional injection molding apparatus, there is a problem that a plurality of processes must be performed outside the end portion of the molded product A after molding, and an improvement in reducing man-hours and costs is desired. It was.
[0008]
OBJECT OF THE INVENTION
The present invention was made in view of the above-described conventional situation, and is an apparatus for injection molding a molded product whose end portion is in an undercut state by a protruding piece protruding in a direction to be folded back with respect to a main body portion, Predetermined molding parts such as chamfering can be molded outside the base end of the projecting piece in a state that eliminates the need for processing after molding, and the undercut molded product is easily released with a simple structure. An object of the present invention is to provide an injection molding apparatus that can perform the above process.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an injection molding apparatus comprising a fixed mold and a movable mold, and an injection molding of a molded product having an end portion in an undercut state by a projecting piece projecting in a direction of folding back with respect to the main body. This is a device that operates on the movable mold corresponding to the inside of the end of the molded product and molds the projecting piece with the movable mold main body, and operates in the process of mold opening to release the molded product. The ejecting means is provided, and the fixed die is provided with a protrusion corresponding to the outside of the base end portion of the protruding piece in an undercut state, and the pusher is inclined with respect to the moving direction of the movable mold in the movable mold body. The movable insert is molded into the movable mold by restricting the movement of the pusher in the moving direction of the movable mold in the initial movement range of the mold opening before the operation of the ejecting means. Move away from the end of the product In addition to the operation restricting means, at least the movable mold side of the fixed mold and the movable mold, the end of the molded product is pushed into the insert side in the initial movement range of the mold opening, and the protruding piece is fixed to the fixed mold. It is set as the structure provided with the edge part mold release means spaced apart from this, and it is set as the means for solving the conventional subject with the said structure. In addition, in Claim 1, the base end part of a protrusion contains a corner | angular part with the main-body part of a molded article, and the protrusion which comprises an undercut state in a fixed mold, Preferably, it is a protrusion of a molded article. And have a smaller protruding dimension. In addition, the initial moving range of the movable mold opening before the operation of the ejecting means is set based on the projecting dimension of the protrusion and the inclination angle formed by the moving direction of the pusher with respect to the moving direction of the movable mold. To do.
[0010]
According to a second aspect of the present invention, there is provided an injection molding apparatus comprising a holding rod through which the pusher slidably penetrates the movable main body in a direction inclined with respect to the moving direction of the movable mold. A holding plate that is movable in the moving direction of the movable mold and that holds the end of the holding rod on the side opposite to the inserter slidably in a direction perpendicular to the moving direction of the movable mold; An elastic body that presses the holding plate toward the movable mold body in the initial movement range, and a return pin that has one end fixed to the holding plate and the other end abutting the fixed mold in the mold closed state, According to a third aspect of the present invention, the ejecting means is disposed between the holding plate and the movable body, and the holding plate moved by pressing of the elastic body of the operation restricting means is in contact with the ejecting plate. And eject pin for moldings extrusion through a fixed and a movable mold body in bets, has a configuration provided with a plate drive mechanism for moving the holding plate and eject plate in contact with each other in the movable mold body. In claim 3, the plate driving mechanism is a mechanism for driving the holding plate to move both plates, or a mechanism for driving the eject plate after connecting both plates with a mechanism that engages and disengages with a predetermined load. Can be used.
[0011]
According to a fourth aspect of the present invention, there is provided an injection molding apparatus according to a fourth aspect, wherein the end part release means is provided with a concavo-convex forming portion for forming concavo-convex portions on the inner side of the projecting piece of the molded product on the movable indenter. According to a fifth aspect of the present invention, the movable mold has a projecting piece release mold for separating the projecting piece of the molded product from the pusher insert after the operation of the operation restricting means and the end part releasing means is completed until the operation of the ejecting means is completed. And a projecting piece releasing means that slidably penetrates the pusher in a direction orthogonal to the moving direction of the movable mold, and one end is a projecting piece of the molded product. A corresponding release pin, a spring that elastically holds the release pin in a state where the surface of one end of the release pin and the outer surface of the inserter are flush with each other, and a spring formed on the movable die body. The inner wall surface of the movable body is provided with an inner wall surface in which the other end of the release pin slides in contact with the movement. Has a configuration which has an inclined surface along the moving direction of the insert push and corresponds to the initial range of movement of the movable mold, a pin pressing plane along the moving direction of the movable die continuously to the inclined surface.
[0012]
Further, in the injection molding apparatus according to the present invention, as claimed in claim 7, the end part release means forms a projecting piece of the molded product between the inserter and the inserter side with respect to the movable die body. In addition to having a projecting piece forming block that can be moved forward and backward, the projecting piece forming block and the fixed die are provided with a cam mechanism that cooperates in the initial movement range of the movable mold to advance the projecting piece forming block to the inserter side. In addition, as claimed in claim 8, the projecting piece forming block is held so as to be able to retract backward from the mold closing position toward the insertion end, and the cam mechanism has a cam mounted on either the projecting piece forming block or the fixed mold. On the other hand, the cam groove is slidably engaged so that the projecting piece forming block is moved forward and backward in the front-rear range of the mold closing position. Note that in claim 8, the cam and the cam groove constituting the cam mechanism are only required to engage with each other at least in the movable initial movement range. For example, the cam groove has an open end, and is fixed. The cam and the cam groove may be completely separated as the movable mold is largely separated.
[0013]
[Effects of the Invention]
In the injection molding apparatus according to claim 1 of the present invention, the movable indenter is a molded product with respect to a molded product whose end is undercut by a projecting piece protruding in the direction of folding back with respect to the main body. The protrusion in the undercut state in the fixed mold corresponds to the outer side of the base end of the protrusion. That is, a predetermined molding site such as chamfering is formed on the outer side of the base end portion of the protruding piece (outside of the corner portion between the main body and the protruding piece) by the fixed-type protruding portion. As a result, the mating surfaces of the fixed mold and the movable mold are set on the projecting piece side, and a step portion due to the mating surfaces of both molds is not generated in the main body of the molded product.
[0014]
In the injection molding apparatus, when the mold is opened, the molded product remains on the movable mold side. In the mold opening process of the movable mold, the base end portion of the projecting piece of the molded product is projected from the projection of the fixed mold. An undercut process for releasing the outer side and an undercut process for releasing the end of the molded product from the insert are finally performed, and the molded product is finally released from the movable mold.
[0015]
Specifically, when the movable mold starts to open the mold and moves in the initial movement range, the pusher is restricted from moving in the movable movement direction by the operation restricting means. Since it is movable in the direction inclined with respect to it, it moves in a direction perpendicular to the moving direction of the movable mold, that is, in a direction away from the end of the molded product, while remaining in the fixed mold side. When the indenter moves in this way, the distance between the indenter and the fixed mold increases by the amount of movement, so that the end of the molded product interposed between them can be deformed by the end mold release means. An undercut process is performed in which the end portion of the molded product is deformed toward the insert and the outer side of the base end portion of the projecting piece of the molded product is released from the protruding portion of the fixed mold.
[0016]
After that, when the movable mold moves beyond the initial movement range, the fixed mold and the movable mold are largely separated from each other, and the pusher is greatly displaced in the inclination direction with respect to the movable mold main body. An undercut process for releasing the end portion is performed, and finally, the molded product is released from the movable die by a push-in insert and an ejecting means.
[0017]
In the injection molding apparatus according to claim 2 of the present invention, the holding plate penetrates the movable mold body by pressing the holding plate to the movable mold body side with an elastic body while the movable mold moves in the initial movement range of the mold opening. The pushing insert is pressed to the fixed mold side through the rod, and the pushing insert is restricted from moving in the moving direction of the movable mold. At this time, the holding rod slidably penetrates the movable main body in an inclined state, and is slidable in a direction perpendicular to the moving direction of the movable type on the holding plate, so that it is orthogonal to the moving direction of the movable type. It shifts in the direction to do. As a result, the pusher moves together with the holding rod in a direction orthogonal to the moving direction of the movable mold, that is, in a direction away from the end of the molded product.
[0018]
Further, when the mold is closed, the return pin comes into contact with the fixed mold, so that the holding plate returns to the mold closing position with respect to the movable mold body, and the elastic body is in a pressure accumulation state and is connected to the holding plate. The inserter returns to the mold closing position together with the holding rod.
[0019]
In the injection molding apparatus according to claim 3 of the present invention, when the movable mold moves beyond the initial movement range of the mold opening, the holding plate is brought into contact with the eject plate to temporarily prevent the movement of the pusher with respect to the movable mold main body. In addition, large deformation of the molded product is prevented by preventing the pusher from protruding too much from the movable mold body. Thereafter, when the movable mold further moves, the holding plate and the eject plate are moved to the movable mold main body side by the plate driving mechanism. Actually, since the movable mold and both plates move relative to each other, the plate driving mechanism functions to prevent the movement of both plates relative to the movable mold that moves. As a result, the insert and the eject pin protrude from the movable mold to release the molded product.
[0020]
In the injection molding apparatus according to claim 4 of the present invention, the concave / convex molding portion provided on the movable indenter forms the concave / convex portions on the inner side of the projection of the molded product, and the end portions of the molded product are formed by engaging the concave / convex portions with each other. The part is pushed and restrained by the insert. Then, when the pusher moves in a direction away from the end of the molded product in the initial movement range of the mold opening, the end of the molded product is moved and deformed together with the pusher, and thus the molded product The end portion is deformed to the push-in side, and the outer side of the base end portion of the protrusion of the molded product is separated from the protrusion of the fixed mold.
[0021]
In the injection molding apparatus according to claim 5 of the present invention, the end part releasing means according to claim 4 separates the outside of the base end part of the protruding piece of the molded product from the protruding part of the fixed mold, and then the ejecting means Before operation, the protruding piece of the molded product is separated from the insert by the protruding piece releasing means to release the engagement between the uneven formed portion of the insert and the uneven of the formed product, and then the molded product Easy mold release.
[0022]
In the injection molding apparatus according to claim 6 of the present invention, the base part outer side of the projecting piece of the molded product is separated from the projecting part of the fixed mold by the end part releasing means according to claim 4, and When the projecting piece is separated from the pusher insert, the other end of the release pin provided on the pusher insert when the movable mold main body and the push insert move relative to each other with the movable mold opening. Slides along the inner wall surface of the movable body. At this time, the inner wall surface of the movable mold body is pushed in while the movable mold moves in the initial movement range, that is, while the proximal end portion of the protruding piece of the molded product is separated from the fixed mold protrusion together with the pusher. The position of the pusher and the release pin does not change, and the one end of the release pin and the outer surface of the pusher are in the same plane. Maintained. Thereafter, when the outer side of the base end portion of the projecting piece of the molded product is separated from the projecting portion of the fixed mold, the inner wall surface of the movable mold body is a plane for pressing the pin along the moving direction of the movable mold, and the pusher is Since it continues to move in an inclined direction with respect to the movable mold body, the release pin moves in the direction of one end against the spring, and as a result, one end of the release pin protrudes from the push-in insert and pushes in. The projecting piece of the molded product is released from the child.
[0023]
In the injection molding apparatus according to claim 7 of the present invention, when the pusher moves in a direction away from the end of the molded product in the initial movement range of the movable mold opening, the movable projecting piece molding block and the fixed block are fixed. The projecting piece molding block moves forward to the inserter side by the action of the cam mechanism provided in the mold, and the end of the molded product is deformed to the inserter side by this projecting piece molding block, and the base end of the projecting piece projecting piece The outside of the part is separated from the fixed projection.
[0024]
In the injection molding apparatus according to claim 8 of the present invention, when the pusher moves in a direction away from the end of the molded product in the initial movement range of the movable mold opening, the movable projecting piece molding block and the fixed block are fixed. The protruding piece molding block moves forward to the inserter side by the action of the cam mechanism provided on the mold, that is, the cam mechanism composed of the cam and the cam groove, and the end of the molded product is deformed to the inserter side. The outer side of the base end portion of the piece is separated from the protrusion of the fixed mold. Thereafter, the projecting piece forming block is moved backward from the mold closing position to the side opposite the insert by the function of the cam mechanism, thereby releasing the end of the molded product and preventing the end of the end from being permanently deformed.
[0025]
【The invention's effect】
According to the injection molding apparatus according to claim 1 of the present invention, when a molded product whose end portion is in an undercut state is projected by a projecting piece projecting in the direction of folding back with respect to the main body, the base of the projecting piece is provided. It becomes possible to form a predetermined molding site such as chamfering on the outside of the end portion without requiring any processing after molding. For example, when the molded product is a vehicle body panel, a fixed mold and a movable mold By setting the mating surface to the part beyond the base end part of the projecting piece, that is, the part that does not become the car body appearance surface, the car body exterior surface including the outside of the base end part of the projecting piece can be molded very well. In addition, even if a step occurs on the mating surface of the fixed mold and the movable mold, there is no effect on the appearance quality, so there is no need to remove the step, which reduces man-hours and costs. Can be realized.
[0026]
Further, according to the injection molding apparatus according to claim 1, in addition to the above-described effects, the operation restricting means and the end part releasing means that operate in the initial movement range of the movable mold opening, and the ejecting means that operates thereafter The undercut process for separating the outside of the base end of the protruding part of the molded product from the protruding part of the fixed mold, the undercut process for releasing the end of the molded product from the indenter, and the molded product Mold release can be performed very smoothly. Moreover, although the protrusions in the fixed mold form an undercut state, all or most of the configuration of each means is provided on the movable mold side, and in particular, the operation regulating means can be configured to accompany the ejecting means. In addition, the structure of the apparatus can be simplified, and no significant change in equipment is required, so that equipment costs can be reduced and maintenance can be facilitated.
[0027]
According to the injection molding apparatus of the second aspect of the present invention, the same effect as in the first aspect can be obtained, and a pusher provided with a holding rod, a holding plate, an elastic body, and a return pin are provided. By adopting the operation restriction means, there is no need for actuators to drive the pusher, and the pusher is moved to the end of the molded product with a simple structure using a movable mold opening operation. Can be moved away from the center, and the insert can be returned to the correct mold closing position by using the mold closing operation, which can contribute to further simplification of the structure of the apparatus and further reduction of the equipment cost. .
[0028]
According to the injection molding apparatus according to claim 3 of the present invention, the same effect as in claim 2 can be obtained, and by adopting an ejecting means including an eject plate, an eject pin, and a plate driving mechanism, After the operation restricting means and the end part releasing means are actuated, it is possible to prevent excessive protrusion of the pusher from the movable mold body and prevent large deformation of the molded product. Thereafter, molding from the pusher is performed. While performing the undercut process of releasing the end of the product, the insert can be used in the same manner as the eject pin to release the molded product satisfactorily. At this time, since the holding plate of the pusher and the eject plate are driven by a common plate driving mechanism, it is possible to contribute to simplification of the structure and reduction of the equipment cost.
[0029]
According to the injection molding apparatus according to the fourth aspect of the present invention, the same effects as in the first to third aspects can be obtained, and the concave-convex forming portion is provided on the movable indenter as the end part releasing means. Therefore, when the indenter is moved away from the end of the molded product, the end of the molded body is constrained to the moving indenter by a very simple structure, and the fixed mold The undercut process for releasing the outer side of the base end portion of the protruding piece of the molded product from the protruding portion can be reliably performed.
[0030]
According to the injection molding apparatus of the fifth aspect of the present invention, the same effect as that of the fourth aspect can be obtained, and the base end of the protruding piece of the molded product can be obtained by the end part releasing means according to the fourth aspect. After the outer side of the part is separated from the protrusion of the fixed mold, the projecting piece releasing means releases the engagement of the uneven part between the protruding part of the molded product and the presser insert. The undercut process for releasing the part and the release of the molded product from the movable die can be easily performed.
[0031]
According to the injection molding apparatus according to claim 6 of the present invention, the same effect as in claim 5 can be obtained, and the inner wall surface of the movable mold body having the inclined surface and the pin pressing plane, the release pin, and Since the projecting piece release means with a spring is adopted, the projecting piece of the molded product is reliably separated from the pushing insert by an extremely simple structure using the relative movement between the movable main body and the pushing insert. Can be made.
[0032]
According to the injection molding apparatus relating to the seventh aspect of the present invention, the same effects as in the first to third aspects can be obtained, and the end part release means including the projecting piece molding block and the cam mechanism is adopted. Therefore, when the pusher is moved in the direction away from the end of the molded product, the end of the molded product is pressed by the projecting piece molding block with a simple structure using a movable mold opening operation. Therefore, it is possible to reliably perform an undercut process in which the outer side of the base end of the molded product protrusion is released from the protrusion of the fixed mold. Because of this structure, the interference between the protrusion of the fixed mold and the molded product can be avoided more reliably.
[0033]
According to the injection molding apparatus relating to the eighth aspect of the present invention, the same effect as in the seventh aspect can be obtained and the cam and the cam groove are adopted as the cam mechanism of the end part release means. With a very simple structure that uses the mold opening operation, the protruding part molding block of the end part release means can be smoothly advanced and retracted, and the base end of the protruding part of the molded product can be driven from the protruding part of the fixed mold. After undercut processing to release the outside of the part, the end of the molded part is released by retreating the protruding piece molding block to the side opposite the insert from the mold closing position to prevent permanent deformation of the end. As a result, it can contribute to improving the quality of the molded product.
[0034]
【Example】
FIGS. 1-6 is a figure explaining one Example of the injection molding apparatus concerning this invention.
[0035]
The injection molding apparatus shown in FIGS. 1 to 3 injection-molds a molded product A whose end is undercut by a projecting piece B between a lower fixed mold 1 and an upper movable mold 2. The molded product A of this embodiment is a front fender panel of an automobile shown in FIG. 14, and has a substantially L-shaped cross section that protrudes in the direction of folding back with respect to the main body at the mating portion with the engine hood panel H. A chamfer R is provided on the outer side of the base end portion D of the projecting piece B including the projecting piece B and including a corner portion with the main body in consideration of appearance quality and the like. That is, when the molded product A is injection-molded with the main body sideways between the fixed mold 1 and the movable mold 2, the projecting piece B is in a state that prevents the mold opening operation, that is, an undercut state. The “movable moving direction” described in the claims is the vertical direction in FIG. 1, and the “direction perpendicular to the moving moving direction” is the horizontal direction in FIG.
[0036]
The fixed mold 1 includes a mounting plate 3 fixed to a molten resin supply device (not shown) and a fixed mold main body 4 that forms a molding space, and includes a primary sprue bush 5, a hot runner block 6, and a secondary sprue bush 7. A gate from the molten resin supply device to the molding space is formed, and a heat insulating plate 8 is interposed between the mounting plate 3 and the hot runner block 6 and the fixed mold body 4.
[0037]
The movable mold 2 includes a mounting plate 9 fixed to a lifting device (not shown) and a movable mold body 10 that forms a molding space, and a plurality of spacers 11 are provided between the mounting plate 9 and the movable mold body 10. An accommodation space 12 for plates to be described later is formed, and a heat insulating plate 13 is interposed between the mounting plate 9 and the spacer 11.
[0038]
The injection molding apparatus operates in the process of mold opening and the pusher 14 that forms the projecting piece B between the movable mold 2 and the movable mold body 10 corresponding to the inside of the end of the molded product A. In addition, an ejecting means for releasing the molded product A is provided, and a projecting portion 15 for forming a chamfer R corresponding to the outside of the base end portion D of the projecting piece B is formed in an undercut state on the stationary mold body 4 of the stationary mold 1. In preparation. That is, in the injection molding apparatus, by forming the chamfer R on the fixed mold 1 side, the mating surface of the fixed mold 1 and the movable mold 2 is set at the horizontal portion of the projecting piece B. A step portion (see FIG. 16) due to the mating surfaces of both molds 1 and 2 does not occur in the main body portion.
[0039]
Furthermore, the injection molding apparatus restricts the movement of the pusher insert 14 in the moving direction of the movable mold 2 in the movable range of the movable mold 2 in the initial movement range of the mold opening before the operation of the ejecting means. Is provided with an operation restricting means for moving the mold in a direction away from the end of the molded product A (the right direction in FIG. 1), and the end of the molded product A is deformed to the side of the inserter 14 in the initial movement range of the mold opening. Thus, an end part releasing means for separating the base end part D of the projecting piece B from the projecting part 15 of the fixed mold 1 is provided. In addition, the movable mold body 10 of the movable mold 2 includes a protruding piece forming block 16 that is partially divided, and a protruding piece between the fixed protruding piece forming block 16 and the movable pusher insert 14. B is formed.
[0040]
The pusher insert 14 has a block shape in which the movable main body 10 is partially divided, and the lower end portion of the holding rod 17 is connected to the upper side. The holding rod 17 penetrates the movable body 10 slidably in a direction inclined with respect to the moving direction of the movable mold 2. As a result, the pusher 14 is held movably in the axial direction of the holding rod 17, that is, in an inclined direction away from the end of the molded product A.
[0041]
The holding rod 17 is connected to a holding plate 18 that can move up and down in the accommodation space 12 at the upper end, which is the end portion on the counter-pressing insert side. At this time, the holding rod 17 penetrates the holding plate 18 and includes a slide block 19 at the upper end. On the other hand, a slide plate 20 with which a slide block 19 is slidably engaged is provided on the upper surface of the holding plate 18. Accordingly, the holding rod 17 is restricted from moving in the vertical direction with respect to the holding plate 18 and is movable in the horizontal direction corresponding to the inclination.
[0042]
The holding plate 18 has an elastic body 21 that presses the holding plate 18 toward the movable mold body 10 in the initial movement range of the mold opening, and slidably penetrates the movable mold body 10 and has a lower end fixed in the mold closed state. A return pin 22 that contacts the upper surface of the mold body 4 is provided. The elastic body 21 is compressed between the upper mounting plate 9 in the mold closed state and presses the holding plate 18 downward. In this embodiment, the holding plate 18, the elastic body 21, and the return pin 22 constitute an operation restricting means that restricts only the rise of the pusher insert 14 in the initial movement range of the mold opening.
[0043]
The ejecting means is disposed between the holding plate 18 and the movable main body 10 and is in contact with the holding plate 18 moved by the pressing of the elastic body 21. The ejecting means is fixed to the eject plate 23 and the movable main body 10 is fixed. A plurality of ejecting pins 24 for extruding the molded product that penetrates, and a plate driving mechanism that moves the holding plate 18 and the ejecting plate 23 that are in contact with each other to the movable body 10 side are provided.
[0044]
Each eject pin 24 is provided with a holding spring 26 between the eject plate 23 and the movable body 10. Further, the eject plate 23 is provided with a stopper pin 34 that penetrates the upper holding plate 18 and contacts the mounting plate 9. The eject plate 23 is kept at a constant distance from the movable body 10 by the holding spring 26 and the stopper pin 34. In this state, each eject pin 24 is held at a position where its lower end surface is flush with the lower surface of the movable body 10. Further, a guide rod 25 for guiding the holding plate 18 and the eject plate 23 in the vertical direction is provided between the mounting plate 9 and the movable body 10.
[0045]
The plate drive mechanism is composed of a drive rod 27 fixed to the eject plate 23 and penetrating the holding plate 18 and the mounting plate 9, and an engagement device 28 that can be engaged and disengaged between the plates 18 and 19. The drive rod 27 is arranged in a state where an upper end surface (not shown) faces the fixed part on the lifting device side, and abuts the fixed part in the ascending process of the movable die 2. The engagement device 28 is composed of, for example, one device that elastically holds a pair of rollers and the other device that is provided with an engagement body between both rollers, and engages both rollers and the engagement body with a predetermined load or more. It is to be combined and detached, and is provided at several locations on the outer periphery of both plates 18 and 23. In other words, in the plate driving mechanism of this embodiment, in the ascending process of the movable mold 2, the plates 18 and 19 are integrated by the engaging device 28, and then the driving rod 27 is brought into contact with the fixed portion so that the plates 18 , 23 is prevented from moving up so that the plates 18 and 23 are moved relative to the movable body 10.
[0046]
The end part release means is formed with irregularities (protrusions in this embodiment) on the inner side of the protruding piece B of the molded product A, particularly on the lower surface of the horizontal portion of the protruding piece B in FIG. The uneven | corrugated shaped part 29 to be provided is provided. In this embodiment, two uneven forming portions 29 are provided. Further, in this embodiment, since the end release means is provided in the pusher insert 14, the operation of the operation restricting means (18, 21, 22) and the end release means (29) is added to the movable mold 2. There is provided a projecting piece releasing means for separating the projecting piece B of the molded product A from the inserter 14 until the ejection means (23, 24, 27, 28) is completed later.
[0047]
The protruding piece release means includes a release pin 30 having a planar end and a spherical other end, and a spring 31 that urges the release pin 30 toward the other end (right direction in FIG. 3). The inner surface 32 of the movable main body 10 with which the other end portion of the release pin 30 is in sliding contact is provided. The release pin 30 penetrates the pusher 14 so as to be slidable in the horizontal direction, and corresponds to a vertical portion of the projecting piece B in FIG. And while being urged by the spring 31 in the direction of the other end, the movement toward the other end is restricted by the stopper 33 fixed to the pusher 14. In this state, the surface of the one end is pushed. It is held so as to be flush with the outer surface of the insert 14. The inner wall surface 32 of the movable mold body 10 corresponds to the initial movement range of the movable mold 2 and the upper inclined surface 32A along the moving direction of the pusher 14 and the moving direction of the movable mold 2 continuously to the inclined surface 32A. Has a vertical pin pressing plane 32B.
[0048]
In the above-described injection molding apparatus, the projecting dimension of the projecting portion 15 in the undercut state in the fixed mold body 4 is clearly smaller than the projecting dimension of the projecting piece B of the molded product A. In addition, the initial movement range of the mold opening of the movable mold 2 before the operation of the ejecting means is the inclination angle formed by the projecting dimension of the protrusion 15 and the moving direction of the pusher 14 with respect to the moving direction of the movable mold 2. Set based on.
[0049]
In the closed state shown in FIGS. 1 to 3, a molding space for the molded product A is formed between the fixed mold body 4, the movable mold body 10 and the pusher 14. 9 and the holding plate 18, the elastic body 21 is compressed, and the holding plate 18 and the eject plate 23 are held with a certain gap S1. The initial movement range of the mold opening corresponds to the gap S1 shown in FIG. 2, and in the inclined surface 32A constituting the protruding piece releasing means, from the center of the release pin 30 to the lower end of the inclined surface 32A. It corresponds to the height S2.
[0050]
Next, the operation of the injection molding apparatus having the above configuration will be described.
[0051]
In the injection molding apparatus, when the mold is opened, the molded product A remains on the movable mold 2 side. In the mold opening process of the movable mold 2, the projection 15 of the fixed mold body 4 projects from the projection 15. Undercut processing for releasing the outside of the base end D of the piece B and undercut processing for releasing the end of the molded product A from the insert 14 are performed, and finally the molded product A is removed from the movable die 2. Release.
[0052]
That is, in the injection molding apparatus, the mold is closed as shown in FIGS. 1 to 3 and the molding space is filled with the molten resin under pressure, and the movable mold 2 is raised after the molten resin is solidified. When the movable mold 2 starts to open the mold and raises the initial movement range, the pusher 14 is pushed down by the elastic body 21 of the operation restricting means during that time, so that the upward movement is substantially restricted. At this time, the pusher 14 is movable in an inclined direction with respect to the movable main body 10 via the holding rod 17, and horizontally with respect to the holding plate 18 via the holding rod 17. Since it is movable, as shown in FIGS. 4 and 5, as the movable mold body 10 is raised, it remains in the state of being left on the fixed mold 1 side, and in a horizontal direction away from the end of the molded product A. Will move.
[0053]
Further, in the injection molding apparatus, the fixed mold body 4 and the movable mold body 10 are separated by an amount corresponding to the initial movement range, the pusher 14 and the movable mold body 10 are separated, and the holding plate 18 is an eject plate. 23, both plates 18 and 23 are connected by the engagement device 28. Thereby, the approach of the holding plate 18 to the movable mold body 10 is temporarily blocked, and the pusher insert 14 does not protrude too much from the movable mold body 10 to prevent a large deformation of the molded product A.
[0054]
Further, in the protruding piece releasing means, the other end portion of the releasing pin 30 is in contact with the inclined surface 32A along the moving direction of the presser insert 14 during the initial movement range, so that the presser insert 14 and the mold release are released. The positional relationship of the pins 30 does not change, and the surface of the one end portion of the release pin 30 and the outer surface of the presser insert 14 are maintained in the same plane. The center of the other end of the release pin 30 reaches the boundary between the inclined surface 32A and the pin pressing flat surface 32B.
[0055]
When the pusher 14 moves horizontally as described above, the distance between the pusher 14 and the fixed mold body 4 increases by the amount of movement, so that the end portion of the molded product A interposed therebetween can be deformed. The end part of the molded product A is deformed toward the insert by the end part releasing means, and the undercut for releasing the outside of the base end D of the projecting piece B in the molded product A from the projecting part 15 of the fixed mold body 4 is performed. Process. That is, in this embodiment, since the end part release means is the concave / convex forming portion 29 provided on the pusher 14, the concave / convex forming portion 29 forms a concave portion on the protruding piece B, and the concave / convex portions are formed by engaging each other. The end of the product A is in a state of being restrained by the pusher insert 14. Therefore, when the pusher 14 moves in the horizontal direction, the end of the molded product A moves together with the pusher 14 with deformation, and the end including the protruding piece B is forced from the fixed mold main body 4 and the protrusion 15. The mold is released so as to peel off.
[0056]
Thereafter, when the movable mold 2 rises beyond the initial movement range, the pusher 14 is also lifted together with the movable mold 2 so that the fixed mold 1 and the movable mold 2 are largely separated, and then the ejecting means and the protruding piece releasing means. Starts operating. In the ejecting means, the upper end portion of the drive rod 27 comes into contact with the fixed portion on the lifting device side, and the raising of the holding plate 18 and the eject plate 23 connected by the engaging device 28 is prevented. As a result, the pusher 14 protrudes obliquely downward relative to the movable body 10 that continues to rise, and the eject pin 24 also protrudes downward while compressing the holding spring 26.
[0057]
Further, when the ejecting means starts operating as described above, in the projecting piece releasing means, the other end portion of the releasing pin 30 contacts the pin pressing flat surface 32B. At this time, while the pusher 14 moves in the inclination direction, the pin pressing flat surface 32B with which the release pin 30 comes into contact is a vertical surface. Therefore, as shown in FIG. Moves against the spring 31 in the direction of one end, and one end of the release pin 30 protrudes from the pusher 14 to forcibly release the engagement between the concave and convex portion 29 and the concave portion of the protruding piece B. The projecting piece B is released from the pusher insert 14.
[0058]
As described above, the injection molding apparatus employs the concavo-convex molded part 29 as the end part releasing means, so that the operation starts when the protruding piece releasing means that operates at the above timing, that is, the ejecting means starts. Further, by using the projecting piece releasing means that completes the operation before the operation of the ejecting means is completed, deformation of the end when releasing the molded product A is prevented, and the entire mold release is facilitated.
[0059]
Thereafter, the pusher insert 14 protrudes obliquely downward from the movable mold body 10, and the undercut process for releasing the end of the molded product A from the pusher insert 14 is finished. At the same time, the eject pin is removed from the movable mold body 10. Largely protrudes downward, and finally the molded product A is completely released from the movable mold 2 by the push-in insert 14 and the eject pin 24.
[0060]
Further, when the movable mold 2 is lowered to perform the next injection molding, the injection molding apparatus lowers both the plates 18 and 23 and the pusher insert 14 by the action of the holding spring 26 compressed when the mold is opened. However, the movable mold body 10 is lowered, and the relative movement of the eject pin 24 returns to the mold closing position. Shifting to the inclined surface 32A, the release mold pin 30 returns to the mold closing position by the action of the spring 31. Further, the stopper pin 34 comes into contact with the mounting plate 9, and the relative movement between the eject plate 23 and the movable main body 10 is stopped.
[0061]
When the movable mold 2 is further lowered, the return pin 22 comes into contact with the upper surface of the fixed mold body 4 in the final movement range of the mold closing, which is the initial movement range of the mold opening, and the lowering of the holding plate 18 is prevented. At this time, since the upward movement of the eject plate 23 is restricted by the stopper pin 34, the engagement device 28 is released, the holding plate 18 is separated from the eject plate 23, and the holding plate 18 is compressed while the elastic body 21 is compressed. 18. The holding rod 17 and the pusher insert 14 are returned to the mold closing position.
[0062]
As described above, the injection molding apparatus described in the above embodiment is an injection molding of a molded product (front fender / panel) A whose end is undercut by the protruding piece B protruding in the direction of folding back with respect to the main body. In this case, the mating surface of the fixed mold 1 and the movable mold 2 (the mating surface of the projecting portion 15 and the movable mold body 10) is set to the projecting piece B side which does not become the vehicle body exterior surface, and the base end portion of the projecting piece B The chamfer R can be formed outside the D in a state where processing after molding is unnecessary, and the vehicle body exterior surface including the chamfer R is molded very well. Further, even if a step portion is generated on the mating surface of the fixed mold 1 and the movable die 2, there is no influence on the appearance quality, so that any processing for removing the step portion later is unnecessary.
[0063]
Further, the injection molding apparatus has an undercut state at a plurality of locations, but includes an ejecting means (23, 24, 27, 28) including a plate driving mechanism (27, 28), an operation restricting means (18, 21). 22), the end part releasing means (29) and the protruding piece releasing means (30, 31, 32A, 32B), the protruding piece B of the molded product A from the protruding part 15 of the fixed mold body 4 is adopted. An undercut process for separating the outside of the base end D, a release of the protruding piece B of the molded product A from the insert 14, an undercut process of releasing the end of the molded product A from the insert 14, and The entire molded product A is released continuously and smoothly.
[0064]
Moreover, the ejecting means, the end part releasing means, and the projecting piece releasing means are all simple structures that operate using the mold opening operation of the movable mold 1, and no dedicated actuators are required at all. In particular, the operation restricting means can be configured to be associated with the ejecting means, and the end part releasing means has a very simple structure of the concavo-convex forming portion 29 for forming the concavo-convex on the protruding piece B. Furthermore, since each of the above means is provided on the movable mold 1 side, the injection molding apparatus can be configured only by partially changing the existing equipment.
[0065]
In the above embodiment, as the plate driving mechanism in the ejecting means, the engaging device 28 for connecting both the plates 18 and 23 and the eject plate 23 are moved to the movable mold body 10 side (the rise is prevented when the mold is opened). The drive rod 27 is illustrated, but the engagement device 28 can be omitted by adopting a drive rod provided between the holding plate 18 and the fixed portion of the lifting device.
[0066]
7-11 is a figure explaining the other Example of the injection molding apparatus concerning this invention. Compared with the previous embodiment, the basic structure of the injection molding apparatus of this embodiment is almost the same as that shown in FIG. The means for deforming the end portion of the product A toward the pusher insert 14 side to separate the outer side of the base end portion D of the protrusion B from the protrusion 15 of the fixed mold 1 is different. There is no mold means. Note that the same components as those in the previous embodiment are denoted by the same reference numerals and detailed description thereof is omitted.
[0067]
The end part releasing means of the injection molding apparatus shown in FIG. 7 is capable of forming the protruding piece B of the molded product A with the presser insert 14 and advancing and retracting to the presser insert 14 side with respect to the movable mold body 10. The projecting piece forming block 16 is provided, and the projecting piece forming block 16 is advanced to the insert 14 side in cooperation with the projecting piece forming block 16 and the fixed mold body 4 of the fixed mold 1 in the initial movement range of the movable mold 1. A cam mechanism is provided.
[0068]
The projecting piece forming block 16 can be moved back and forth horizontally with respect to the presser insert 14 by a slide mechanism 41 interposed between the movable mold body 10 and the return spring interposed between the movable block body 10 and the return spring. 42 is biased in the backward direction (left direction in FIG. 7), and the backward position is regulated by the stopper block 43 provided in the movable body 10. The advancing / retreating range of the projecting piece forming block 16 is the same as the advancing position where the tip end portion 16A corresponding to the vertical portion of the projecting piece B in FIG. The portion 14 </ b> A is between the retreat position where the portion 14 </ b> A is immersed in the counter-pressing insert 14 side rather than the inner side surface of the movable body 10 and is regulated by the stopper block 43.
[0069]
Further, the projecting piece forming block 16 can be positioned by a cam mechanism when the mold is closed, but has a cam surface 44 at the rear end portion to make the positioning operation more reliable. By bringing the surface 44 into contact with the cam surface 45 of the fixed mold main body 4, the tip end portion 16 </ b> A is held at a mold closing position that is flush with the inner side surface of the movable mold main body 10.
[0070]
As shown in FIG. 8, the cam mechanism is composed of a circular cam 46 provided on the side surface of the projecting piece molding block 16 and a cam groove 48 of the cam block 47 provided on the fixed mold body 4. The cam groove 48 is a "<"-shaped groove that is bent toward the push-in insert 14 and has an open upper end so that the cam 46 of the projecting piece molding block 16 is slidably engaged.
[0071]
The injection molding apparatus having the above-described configuration is a direction in which the pusher 14 is separated from the end of the molded product A in the initial movement range of the mold opening of the movable mold 2 after injection molding as shown in FIG. As the cam groove 48 and the cam 46 that are engaged with each other move relative to each other, the projecting piece forming block 16 moves toward the pusher insert 14 while compressing the return spring 42. As shown in FIG. 10, the projecting piece B is pushed toward the insert 14 by the tip portion 16A. At this time, the cam 46 is located at a bent portion of the cam groove 48 having a “<” shape. Thus, an undercut process is performed in which the outer side of the base end portion D of the projecting piece B in the molded product A is released from the projecting portion 15 of the fixed mold body 4.
[0072]
Next, when the movable mold 2 rises beyond the initial movement range and the end portion of the molded product A is completely separated from the fixed mold main body 4, the projecting piece is generated along with the relative movement of the cam groove 48 and the cam 46. As shown in FIG. 11, the forming block 16 is retracted, and the distal end portion 16 </ b> A is retracted from the inner side surface of the movable mold body 10. As a result, the end portion of the molded product A is in a free state in which the protruding piece B is caught by the pusher insert 14, and permanent deformation is prevented and subsequent release is facilitated. When the movable mold 2 is further raised, the cam 46 is detached from the cam groove 48, and thereafter, the molded product A is released in the same manner as in the previous embodiment.
[0073]
As described above, even in the injection molding apparatus of the above-described embodiment, the mold opening operation of the movable mold 2 is used in the end part release means (16, 46, 48) without using dedicated actuators. Due to the simple structure, the undercut process of releasing the outer side of the base end portion D of the projecting piece B from the projecting portion 15 is favorably performed.
[0074]
Here, when the outside of the base end portion D of the projecting piece B is released from the projecting portion 15, the end portion of the molded product A is constrained to the insert 14 by the engagement of the projections and recesses as in the previous embodiment. In the product, when the end portion of the molded product A is deformed to the side of the insert 14, the end portion is also deformed slightly upward, so that the portion of the chamfer R is an arc-shaped locus as shown in FIG. Release while drawing C1. On the other hand, as shown in FIG. 13, in the case where the outer side of the base end portion D of the projecting piece B is pushed horizontally from the projecting portion 15 by the projecting piece forming block 16, as shown in FIG. Since the part is released while drawing a linear locus C2, the interference between the protrusion 15 and the molded product A can be more reliably avoided. Therefore, in the case where the chamfer R is formed outside the base end portion D of the projecting piece B, there is no particular problem in each of the embodiments, but for example, a stepped shape is formed outside the base end portion D of the projecting piece B. When providing a predetermined molding site, it is more desirable to have a structure in which the projecting piece B is extruded horizontally as in the above embodiment.
[0075]
In the above embodiment, the cam 46 on the protruding piece forming block 16 side and the cam block 46 and the cam groove 48 on the fixed mold body 4 side are exemplified as the cam mechanism. However, the cam 46 and the cam groove 48 are turned upside down. It is possible to establish a relationship, and other cam mechanisms can naturally be employed.
[Brief description of the drawings]
FIG. 1 is a sectional view for explaining an embodiment of an injection molding apparatus according to the present invention.
FIG. 2 is a cross-sectional view illustrating a main part of the injection molding apparatus shown in FIG.
FIG. 3 is an enlarged cross-sectional view illustrating the vicinity of a presser insert shown in FIG.
FIG. 4 is a cross-sectional view for explaining a main part of the injection molding apparatus when the movable mold has moved up the initial movement range.
5 is an enlarged cross-sectional view illustrating the vicinity of the presser insert shown in FIG. 4; FIG.
6 is a cross-sectional view illustrating a state in which the movable mold is further raised from the state shown in FIG. 5 and the protruding piece releasing means is activated. FIG.
FIG. 7 is a view for explaining another embodiment of the injection molding apparatus according to the present invention, and is a cross-sectional view for enlarging and explaining the vicinity of the pusher insert in the mold closed state.
FIG. 8 is a perspective view for explaining a cam mechanism together with a projecting piece forming block and a cam block.
9 is a cross-sectional view illustrating a state in which the movable mold has raised the initial movement range from the state shown in FIG.
10 is a cross-sectional view illustrating a state in which the movable mold is further raised from the state shown in FIG. 9 and the protruding piece forming block of the protruding piece releasing means is advanced.
11 is a cross-sectional view for explaining a state in which the movable mold is further raised from the state shown in FIG.
12 is a cross-sectional view for explaining the locus when the outer side of the base end portion of the protruding piece is released from the protruding portion of the fixed mold in the injection molding apparatus of the embodiment shown in FIGS.
13 is a cross-sectional view for explaining a locus when the outer side of the base end portion of the protruding piece is released from the protruding portion of the fixed mold in the injection molding apparatus of the embodiment shown in FIGS. 7 to 11; FIG.
FIG. 14 is a perspective view showing the front fender panel of an automobile as an example of a molded article (a), a perspective view (b) inside the car body, and a cross-sectional view (c) showing a mating portion with the hood panel; It is.
FIG. 15 is a sectional view (a) in a mold closing state, a sectional view in the middle of mold opening (b), and a sectional view (c) after completion of mold opening for explaining a conventional injection molding apparatus.
FIGS. 16A and 16B are cross-sectional views (a) and (b) for explaining a mating surface of a fixed mold and a movable mold and a molded product in a conventional injection molding apparatus.
[Explanation of symbols]
A Molded product
B Projection
D Base end of the projecting piece
1 Fixed type
2 Movable type
10 Movable body
14 Pushing in
15 Projections
16 Projection block molding block (end part release means)
17 Holding rod
18 Holding plate (operation restricting means)
21 Elastic body (operation restricting means)
22 Return pin (operation regulation means)
23 Eject plate (Eject means)
24 Eject pin (Eject means)
27 Drive rod (plate drive mechanism for ejecting means)
28 Engaging device (plate drive mechanism of ejecting means)
29 Concavity and convexity molding part (end part release means)
30 Release pin (projection piece release means)
31 Spring (Projection piece release means)
32 Inner wall surface (projection piece release means)
32A inclined surface (projection piece release means)
32B Pin pressing plane (projection piece release means)
46 Cam (Cam mechanism of end release means)
48 Cam groove (cam mechanism for end release means)

Claims (8)

固定型および可動型を備えると共に、本体部に対して折返す方向に突出する突片により端部がアンダーカット状態となる成形品を射出成形する装置であって、可動型に、成形品の端部内側に対応し且つ可動型本体との間で突片を成形する押し入子と、型開きの過程で作動して成形品を離型させるエジェクト手段を備えると共に、固定型に、突片の基端部外側に対応する突部をアンダーカット状態に備え、押し入子は、可動型本体において可動型の移動方向に対して傾斜した方向に移動自在に保持してあり、可動型に、エジェクト手段の作動前である型開きの初期移動範囲において可動型の移動方向への押し入子の移動を規制することで同押し入子を成形品の端部から離間する方向に移動させる動作規制手段を備えると共に、固定型および可動型のうちの少なくとも可動型側に、型開きの初期移動範囲において成形品の端部を押し入子側に変形させて突片の基端部外側を固定型の突部から離間させる端部離型手段を備えたことを特徴とする射出成形装置。An apparatus that includes a fixed mold and a movable mold, and that injection-molds a molded product whose end is undercut by a projecting piece protruding in a direction to be folded back with respect to the main body. A push-in insert that corresponds to the inside of the part and molds the projecting piece with the movable mold body, and an ejecting means that operates in the process of opening the mold to release the molded product. A protrusion corresponding to the outer side of the base end is provided in an undercut state, and the pusher is held in the movable body so as to be movable in a direction inclined with respect to the moving direction of the movable mold. Operation restricting means for restricting the movement of the pusher in the moving direction of the movable mold in the initial movement range of the mold opening before the operation of the means to move the pusher in the direction away from the end of the molded product With fixed and movable At least the movable mold side of the mold, the end mold release for deforming the end of the molded product to the insert side in the initial movement range of the mold opening and separating the outer base end of the projecting piece from the fixed mold projecting section An injection molding apparatus comprising means. 押し入子が、可動型の移動方向に対して傾斜した方向に可動型本体を摺動自在に貫通する保持ロッドを備えており、動作規制手段が、可動型の移動方向に移動可能であり且つ保持ロッドの反押し入子側の端部を可動型の移動方向に対して直交する方向に摺動自在に保持する保持プレートと、型開きの初期移動範囲において保持プレートを可動型本体側に押圧する弾性体と、保持プレートに一端部が固定され且つ型閉じ状態において他端部が固定型に当接するリターンピンを備えていることを特徴とする請求項１に記載の射出成形装置。The pusher includes a holding rod that slidably penetrates the movable body in a direction inclined with respect to the movable movement direction, and the operation restricting means is movable in the movable movement direction; A holding plate that slidably holds the end of the holding rod on the counter-pushing insert side in a direction orthogonal to the moving direction of the movable mold, and presses the holding plate toward the movable mold body in the initial movement range of the mold opening The injection molding apparatus according to claim 1, further comprising: an elastic body that includes: a return pin that has one end fixed to the holding plate and the other end abutting against the fixed mold when the mold is closed. エジェクト手段が、保持プレートと可動型本体との間に配置され且つ動作規制手段の弾性体の押圧により移動した保持プレートが当接するエジェクトプレートと、エジェクトプレートに固定され且つ可動型本体を貫通する成形品押し出し用のエジェクトピンと、互いに当接した保持プレートおよびエジェクトプレートを可動型本体側に移動させるプレート駆動機構を備えたことを特徴とする請求項２に記載の射出成形装置。The ejecting means is disposed between the holding plate and the movable mold body, and the ejecting plate abuts the holding plate moved by the pressing of the elastic body of the operation restricting means, and the molding fixed to the eject plate and penetrating the movable mold body 3. The injection molding apparatus according to claim 2, further comprising: an eject pin for extruding the product, a holding plate that is in contact with each other, and a plate driving mechanism that moves the eject plate toward the movable body. 端部離型手段が、可動型の押し入子に、成形品の突片の内側に凹凸を成形する凹凸成形部を備えていることを特徴とする請求項１〜３のいずれかに記載の射出成形装置。The end part release means is provided with a concavo-convex forming part for forming concavo-convex parts on the inner side of the projecting piece of the molded product in the movable indenter. Injection molding equipment. 可動型が、動作規制手段および端部離型手段の作動後からエジェクト手段の作動完了に至る間に成形品の突片を押し入子から離間させる突片離型手段を備えていることを特徴とする請求項４に記載の射出成形装置。The movable mold is provided with a projecting piece releasing means for separating the projecting piece of the molded product from the inserter after the operation restricting means and the end part releasing means are operated until the operation of the ejecting means is completed. The injection molding apparatus according to claim 4. 突片離型手段が、可動型の移動方向に直交する方向に押し入子を摺動自在に貫通し且つ一端部が成形品の突片に対応する離型ピンと、離型ピンの一端部の面と押し入子の外側面とが同一面になる状態に離型ピンを弾性保持するスプリングと、可動型本体に形成され且つ押し入子の移動に伴って離型ピンの他端部が摺動接触する内壁面を備え、可動型本体の内壁面が、可動型の初期移動範囲に対応し且つ押し入子の移動方向に沿う傾斜面と、傾斜面に連続して可動型の移動方向に沿うピン押圧用平面を有していることを特徴とする請求項５に記載の射出成形装置。The projecting piece releasing means slidably penetrates the inserter in a direction orthogonal to the moving direction of the movable mold and has one end portion corresponding to the projecting piece of the molded product, and one end portion of the releasing pin. A spring that elastically holds the release pin so that the surface and the outer surface of the pusher are flush with each other, and the other end of the release pin that slides on the movable body and moves with the pusher. The inner wall surface of the movable body has an inclined surface corresponding to the initial moving range of the movable type and along the moving direction of the pusher, and in the movable moving direction continuously to the inclined surface. The injection molding apparatus according to claim 5, further comprising a pin pressing flat surface. 端部離型手段が、押し入子との間で成形品の突片を成形し且つ可動型本体に対して押し入子側に進退可能な突片成形ブロックを備えると共に、突片成形ブロックおよび固定型に、可動型の初期移動範囲において協働して突片成形ブロックを押し入子側に前進させるカム機構を備えたことを特徴とする請求項１〜３のいずれかに記載の射出成形装置。The end part release means includes a projecting piece forming block that forms a projecting piece of a molded product with the inserter and can move forward and backward toward the inserter with respect to the movable mold body, and a projecting piece forming block, The injection mold according to any one of claims 1 to 3, wherein the fixed mold is provided with a cam mechanism for cooperating in the initial movement range of the movable mold to advance the projecting piece molding block to the insert side. apparatus. 突片成形ブロックが、型閉じ位置よりも反押し入子側に後退可能に保持されており、カム機構が、突片成形ブロックおよび固定型のいずれか一方に、カムを備えると共に、他方に、カムが摺動自在に係合して突片成形ブロックを型閉じ位置の前後範囲に進退動作させるするたカム溝を備えたことを特徴とする請求項７に記載の射出成形装置。The projecting piece forming block is held so as to be able to retract toward the side opposite to the insert from the mold closing position, and the cam mechanism includes a cam on one of the projecting piece forming block and the fixed mold, and on the other side, 8. The injection molding apparatus according to claim 7, further comprising a cam groove for slidably engaging the cam so as to move the protruding piece molding block forward and backward in the front-rear range of the mold closing position.
JP2000038366A 2000-02-16 2000-02-16 Injection molding equipment Expired - Fee Related JP4277409B2 (en)

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JP4825509B2 (en) * 2005-12-15 2011-11-30 三菱自動車工業株式会社 Molding method of resin parts
KR100882651B1 (en) * 2006-12-12 2009-02-06 현대자동차주식회사 Mold system for panel
JP4900595B2 (en) * 2007-06-01 2012-03-21 トヨタ自動車株式会社 Manufacturing method of foamed resin products
KR101577436B1 (en) 2015-09-30 2015-12-14 주식회사 갑을프라스틱 A injection molding apparatus of a portable terminal protection cover
CN108673835A (en) * 2018-08-15 2018-10-19 奥克斯空调股份有限公司 A kind of cavity jacking structure and injection mold
CN109849285B (en) * 2018-12-26 2023-09-29 东莞广泽汽车饰件有限公司 Injection molding die of automobile cup stand panel
CN109955442A (en) * 2019-04-15 2019-07-02 厦门优加模具有限公司 The preceding compound bullet slider mould of mould
IT201900012915A1 (en) * 2019-07-26 2021-01-26 Valter Ferlin Inclined movement extractor

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